From 3adeb629b32b379834f61e2f46d80f62346fdf08 Mon Sep 17 00:00:00 2001
From: Magnus Danielsson <magnus.danielsson@riotgames.com>
Date: Wed, 6 Jul 2016 15:53:47 -0700
Subject: Make it easier to compile on windows.

---
 xdelta3/xdelta3-internal.h |  4 ++--
 xdelta3/xdelta3.h          | 15 +++++++++++++++
 2 files changed, 17 insertions(+), 2 deletions(-)

diff --git a/xdelta3/xdelta3-internal.h b/xdelta3/xdelta3-internal.h
index c807648..0c6a1bb 100644
--- a/xdelta3/xdelta3-internal.h
+++ b/xdelta3/xdelta3-internal.h
@@ -369,13 +369,13 @@ usize_t xd3_checksum_hash (const xd3_hash_cfg *cfg, const usize_t cksum);
 
 #if USE_UINT32
 uint32_t xd3_large32_cksum (xd3_hash_cfg *cfg, const uint8_t *base, const usize_t look);
-uint32_t xd3_large32_cksum_update (xd3_hash_cfg *cfg, uint32_t cksum, 
+uint32_t xd3_large32_cksum_update (xd3_hash_cfg *cfg, const uint32_t cksum,
 				   const uint8_t *base, const usize_t look);
 #endif /* USE_UINT32 */
 
 #if USE_UINT64
 uint64_t xd3_large64_cksum (xd3_hash_cfg *cfg, const uint8_t *base, const usize_t look);
-uint64_t xd3_large64_cksum_update (xd3_hash_cfg *cfg, uint64_t cksum, 
+uint64_t xd3_large64_cksum_update (xd3_hash_cfg *cfg, const uint64_t cksum,
 				   const uint8_t *base, const usize_t look);
 #endif /* USE_UINT64 */
 
diff --git a/xdelta3/xdelta3.h b/xdelta3/xdelta3.h
index b513efb..f98eb2a 100644
--- a/xdelta3/xdelta3.h
+++ b/xdelta3/xdelta3.h
@@ -115,7 +115,9 @@
 #include <inttypes.h>
 #include <stdint.h>
 #else /* WIN32 case */
+#ifndef WIN32_LEAN_AND_MEAN
 #define WIN32_LEAN_AND_MEAN
+#endif
 
 #ifndef WINVER
 #if XD3_USE_LARGEFILE64
@@ -378,7 +380,11 @@ typedef struct {
 } shortbuf;
 
 #ifndef PRINTF_ATTRIBUTE
+#ifdef __GNUC__
 #define PRINTF_ATTRIBUTE(x,y) __attribute__ ((__format__ (__printf__, x, y)))
+#else
+#define PRINTF_ATTRIBUTE(x,y)
+#endif
 #endif
 
 /* Underlying xprintf() */
@@ -1099,6 +1105,11 @@ struct _xd3_stream
  PUBLIC FUNCTIONS
  **************************************************************************/
 
+#ifdef __cplusplus
+extern "C" {
+#endif // __cplusplus
+
+
 /* This function configures an xd3_stream using the provided in-memory
  * input buffer, source buffer, output buffer, and flags.  The output
  * array must be large enough or else ENOSPC will be returned.  This
@@ -1429,6 +1440,10 @@ void xd3_blksize_add (xoff_t *blkno,
   XD3_ASSERT (*blkoff < source->blksize);
 }
 
+#ifdef __cplusplus
+} // extern "C"
+#endif
+
 #define XD3_NOOP 0U
 #define XD3_ADD 1U
 #define  XD3_RUN 2U
-- 
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